'\"
'\" Generated from file 'csv\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2002-2015 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>
'\"
.TH "csv" n 0\&.8\&.1 tcllib "CSV processing"
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.BS
.SH NAME
csv \- Procedures to handle CSV data\&.
.SH SYNOPSIS
package require \fBTcl  8\&.4\fR
.sp
package require \fBcsv  ?0\&.8\&.1?\fR
.sp
\fB::csv::iscomplete\fR \fIdata\fR
.sp
\fB::csv::join\fR \fIvalues\fR ?\fIsepChar\fR? ?\fIdelChar\fR? ?\fIdelMode\fR?
.sp
\fB::csv::joinlist\fR \fIvalues\fR ?\fIsepChar\fR? ?\fIdelChar\fR? ?\fIdelMode\fR?
.sp
\fB::csv::joinmatrix\fR \fImatrix\fR ?\fIsepChar\fR? ?\fIdelChar\fR? ?\fIdelMode\fR?
.sp
\fB::csv::read2matrix\fR ?\fB-alternate\fR? \fIchan m\fR {\fIsepChar\fR ,} {\fIexpand\fR none}
.sp
\fB::csv::read2queue\fR ?\fB-alternate\fR? \fIchan q\fR {\fIsepChar\fR ,}
.sp
\fB::csv::report\fR \fIcmd matrix\fR ?\fIchan\fR?
.sp
\fB::csv::split\fR ?\fB-alternate\fR? \fIline\fR ?\fIsepChar\fR? ?\fIdelChar\fR?
.sp
\fB::csv::split2matrix\fR ?\fB-alternate\fR? \fIm line\fR {\fIsepChar\fR ,} {\fIexpand\fR none}
.sp
\fB::csv::split2queue\fR ?\fB-alternate\fR? \fIq line\fR {\fIsepChar\fR ,}
.sp
\fB::csv::writematrix\fR \fIm chan\fR ?\fIsepChar\fR? ?\fIdelChar\fR?
.sp
\fB::csv::writequeue\fR \fIq chan\fR ?\fIsepChar\fR? ?\fIdelChar\fR?
.sp
.BE
.SH DESCRIPTION
.PP
The \fBcsv\fR package provides commands to manipulate information
in CSV \fBFORMAT\fR (CSV = Comma Separated Values)\&.
.SH COMMANDS
.PP
The following commands are available:
.TP
\fB::csv::iscomplete\fR \fIdata\fR
A predicate checking if the argument \fIdata\fR is a complete csv
record\&. The result is a boolean flag indicating the completeness of
the data\&. The result is true if the data is complete\&.
.TP
\fB::csv::join\fR \fIvalues\fR ?\fIsepChar\fR? ?\fIdelChar\fR? ?\fIdelMode\fR?
Takes a list of values and returns a string in CSV format containing
these values\&. The separator character can be defined by the caller,
but this is optional\&. The default is ","\&. The quoting aka delimiting character can
be defined by the caller, but this is optional\&. The default is '"'\&.
By default the quoting mode \fIdelMode\fR is "auto", surrounding
values with \fIdelChar\fR only when needed\&. When set to "always"
however, values are always surrounded by the \fIdelChar\fR instead\&.
.TP
\fB::csv::joinlist\fR \fIvalues\fR ?\fIsepChar\fR? ?\fIdelChar\fR? ?\fIdelMode\fR?
Takes a list of lists of values and returns a string in CSV format
containing these values\&. The separator character can be defined by the
caller, but this is optional\&. The default is ","\&. The quoting character
can be defined by the caller, but this is optional\&. The default is '"'\&.
By default the quoting mode \fIdelMode\fR is "auto", surrounding
values with \fIdelChar\fR only when needed\&. When set to "always"
however, values are always surrounded by the \fIdelChar\fR instead\&.
Each element of the outer list is considered a record, these are
separated by newlines in the result\&. The elements of each record are
formatted as usual (via \fB::csv::join\fR)\&.
.TP
\fB::csv::joinmatrix\fR \fImatrix\fR ?\fIsepChar\fR? ?\fIdelChar\fR? ?\fIdelMode\fR?
Takes a \fImatrix\fR object following the API specified for the
struct::matrix package and returns a string in CSV format containing
these values\&. The separator character can be defined by the caller,
but this is optional\&. The default is ","\&. The quoting character
can be defined by the caller, but this is optional\&. The default is
\'"'\&.
By default the quoting mode \fIdelMode\fR is "auto", surrounding
values with \fIdelChar\fR only when needed\&. When set to "always"
however, values are always surrounded by the \fIdelChar\fR instead\&.
Each row of the matrix is considered a record, these are
separated by newlines in the result\&. The elements of each record are
formatted as usual (via \fB::csv::join\fR)\&.
.TP
\fB::csv::read2matrix\fR ?\fB-alternate\fR? \fIchan m\fR {\fIsepChar\fR ,} {\fIexpand\fR none}
A wrapper around \fB::csv::split2matrix\fR (see below) reading
CSV-formatted lines from the specified channel (until EOF) and adding
them to the given matrix\&. For an explanation of the \fIexpand\fR
argument see \fB::csv::split2matrix\fR\&.
.TP
\fB::csv::read2queue\fR ?\fB-alternate\fR? \fIchan q\fR {\fIsepChar\fR ,}
A wrapper around \fB::csv::split2queue\fR (see below) reading
CSV-formatted lines from the specified channel (until EOF) and adding
them to the given queue\&.
.TP
\fB::csv::report\fR \fIcmd matrix\fR ?\fIchan\fR?
A report command which can be used by the matrix methods
\fBformat 2string\fR and \fBformat 2chan\fR\&. For the latter this
command delegates the work to \fB::csv::writematrix\fR\&. \fIcmd\fR is
expected to be either \fBprintmatrix\fR or
\fBprintmatrix2channel\fR\&. The channel argument, \fIchan\fR, has
to be present for the latter and must not be present for the first\&.
.TP
\fB::csv::split\fR ?\fB-alternate\fR? \fIline\fR ?\fIsepChar\fR? ?\fIdelChar\fR?
converts a \fIline\fR in CSV format into a list of the values
contained in the line\&. The character used to separate the values from
each other can be defined by the caller, via \fIsepChar\fR, but this
is optional\&. The default is ","\&. The quoting character can be defined
by the caller, but this is optional\&. The default is '"'\&.
.sp
If the option \fB-alternate\fR is specified a slightly different
syntax is used to parse the input\&. This syntax is explained below, in
the section \fBFORMAT\fR\&.
.TP
\fB::csv::split2matrix\fR ?\fB-alternate\fR? \fIm line\fR {\fIsepChar\fR ,} {\fIexpand\fR none}
The same as \fB::csv::split\fR, but appends the resulting list as a
new row to the matrix \fIm\fR, using the method \fBadd row\fR\&. The
expansion mode specified via \fIexpand\fR determines how the command
handles a matrix with less columns than contained in \fIline\fR\&. The
allowed modes are:
.RS
.TP
\fBnone\fR
This is the default mode\&. In this mode it is the responsibility of the
caller to ensure that the matrix has enough columns to contain the
full line\&. If there are not enough columns the list of values is
silently truncated at the end to fit\&.
.TP
\fBempty\fR
In this mode the command expands an empty matrix to hold all columns
of the specified line, but goes no further\&. The overall effect is that
the first of a series of lines determines the number of columns in the
matrix and all following lines are truncated to that size, as if mode
\fBnone\fR was set\&.
.TP
\fBauto\fR
In this mode the command expands the matrix as needed to hold all
columns contained in \fIline\fR\&. The overall effect is that after
adding a series of lines the matrix will have enough columns to hold
all columns of the longest line encountered so far\&.
.RE
.TP
\fB::csv::split2queue\fR ?\fB-alternate\fR? \fIq line\fR {\fIsepChar\fR ,}
The same as \fB::csv::split\fR, but appending the resulting list as a
single item to the queue \fIq\fR, using the method \fBput\fR\&.
.TP
\fB::csv::writematrix\fR \fIm chan\fR ?\fIsepChar\fR? ?\fIdelChar\fR?
A wrapper around \fB::csv::join\fR taking all rows in the matrix
\fIm\fR and writing them CSV formatted into the channel \fIchan\fR\&.
.TP
\fB::csv::writequeue\fR \fIq chan\fR ?\fIsepChar\fR? ?\fIdelChar\fR?
A wrapper around \fB::csv::join\fR taking all items in the queue
\fIq\fR (assumes that they are lists) and writing them CSV formatted
into the channel \fIchan\fR\&.
.PP
.SH FORMAT
.PP
The format of regular CSV files is specified as
.IP [1]
Each record of a csv file (comma-separated values, as exported e\&.g\&. by
Excel) is a set of ASCII values separated by ","\&. For other languages
it may be ";" however, although this is not important for this case as
the functions provided here allow any separator character\&.
.IP [2]
If and only if a value contains itself the separator ",", then it (the
value) has to be put between ""\&. If the value does not contain the
separator character then quoting is optional\&.
.IP [3]
If a value contains the character ", that character is represented by ""\&.
.IP [4]
The output string "" represents the value "\&. In other words, it is
assumed that it was created through rule 3, and only this rule,
i\&.e\&. that the value was not quoted\&.
.PP
.PP
An alternate format definition mainly used by MS products specifies
that the output string "" is a representation of the empty
string\&. In other words, it is assumed that the output was generated
out of the empty string by quoting it (i\&.e\&. rule 2), and not through
rule 3\&. This is the only difference between the regular and the
alternate format\&.
.PP
The alternate format is activated through specification of the option
\fB-alternate\fR to the various split commands\&.
.SH EXAMPLE
Using the regular format the record
.PP
.CS


123,"123,521\&.2","Mary says ""Hello, I am Mary""",""

.CE
.PP
is parsed into the items
.PP
.CS


a) 123
b) 123,521\&.2
c) Mary says "Hello, I am Mary"
d) "

.CE
.PP
Using the alternate format the result is
.PP
.CS


a) 123
b) 123,521\&.2
c) Mary says "Hello, I am Mary"
d) (the empty string)

.CE
instead\&. As can be seen only item (d) is different, now the empty string
instead of a "\&.
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIcsv\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH "SEE ALSO"
matrix, queue
.SH KEYWORDS
csv, matrix, package, queue, tcllib
.SH CATEGORY
Text processing
.SH COPYRIGHT
.nf
Copyright (c) 2002-2015 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>

.fi
